multiple indexing with slow query - mysql

Question

In following query I indexed every field like:
menu.id
pricelist.menu_id
vendors.id
pricelist.vendor
orders.pricelist_id
pricelist.id
users.id
orders.user_id
orders.free
pricelist.menu_id.
When I run the below query it takes much time, we have 13 million records in orders table and other table has few thousands.
SELECT
`orders`.`itusername`,
`orders`.`iturl`,
`orders`.`error_message`,
`orders`.`return` AS return1,
`orders`.`coupon`,
DATEDIFF( users.reseller_expiry, now( ) ) AS edays,
`users`.`email`,
`menu`.`menuname`,
`orders`.`error_status`,
`orders`.`auto_status`,
`vendors`.`name`,
`vendors`.`id` AS venderid,
`pricelist`.`servicename`,
`orders`.`email_order` AS paypal_order_email,
`orders`.`user_id`,
`orders`.`services_order`,
`orders`.`created_dt`,
`orders`.`id`,
`orders`.`transaction_comment`,
`orders`.`url`,
`orders`.`requireviews`,
`orders`.`youtubeviews`,
`orders`.`total_views_completed`,
`orders`.`aff`,
`orders`.`is_package`,
`orders`.`price`,
`orders`.`order_from_site`,
`orders`.`cost_per_unit_order`,
`orders`.`service_name_order`,
`orders`.`status`,
`orders`.`start_api_date`,
`orders`.`end_api_date`,
`orders`.`allow_setting`,
`orders`.`return2`,
`users`.`balance` AS user_balance
FROM
( `pricelist` )
JOIN `menu` ON `menu`.`id` = `pricelist`.`menu_id`
JOIN `vendors` ON `vendors`.`id` = `pricelist`.`vendor`
JOIN `orders` ON `orders`.`pricelist_id` = `pricelist`.`id`
JOIN `users` ON `users`.`id` = `orders`.`user_id`
WHERE
`orders`.`free` != 1
AND pricelist.menu_id = 3
ORDER BY
`orders`.`id` DESC
LIMIT 10.
.................................

Answer 1

The trick is to do the LIMIT before running around to 5 tables.
SELECT ...
FROM
( SELECT orders.pricelist_id AS id
FROM pricelist
JOIN `orders` ON `orders`.`pricelist_id` = `pricelist`.`id`
WHERE `orders`.`free` != 1
AND pricelist.menu_id = 3
ORDER BY `orders`.`id` DESC
LIMIT 10
) AS x
JOIN `pricelist` ON pricelist.id = x.id
JOIN `menu` ON `menu`.`id` = `pricelist`.`menu_id`
JOIN `vendors` ON `vendors`.`id` = `pricelist`.`vendor`
JOIN `orders` ON `orders`.`pricelist_id` = x.`id`
JOIN `users` ON `users`.`id` = `orders`.`user_id`
ORDER BY `orders`.`id` DESC
There is a unknown -- are the tables 1:1 or 1:many or many:1 or many:many? With the 'wrong' answers, you will get more than 10 rows, and the design is flawed.