MySQL query too slow about 25 seconds - mysql

Question

I have a MySQL query and it takes about 25 sec. There are not many rows (just about 200) but I don't understand why it takes long time.
Query:
SELECT *
, c.id c_id
FROM campaign c
JOIN campaign_category cc
ON c.campaign_type = cc.id
WHERE c.is_deleted = 0
AND c.status = 1
AND c.id NOT IN (SELECT campaign_id FROM user_reviews WHERE user_id = 4)
AND c.amt_req > (SELECT COUNT(id)
FROM reserved_reviews
WHERE camping_id = c.id
AND user_id != 4)
+ (SELECT COUNT(id)
FROM user_reviews
WHERE campaign_id = c.id)
Edit:
I tried with JOIN like this but i got no result:
SELECT
*, `c`.`id` as `c_id`,COUNT(`ur`.`id`) as `total_reviewed`, COUNT(`rr`.`id`) as `total_reserved`
FROM
`campaign` `c`
JOIN `campaign_category` `cc` ON `c`.`campaign_type`=`cc`.`id`
JOIN `user_reviews` `ur` ON `ur`.`campaign_id`=`c`.`id`
JOIN `reserved_reviews` `rr` ON `rr`.`camping_id`=`c`.`id`
WHERE
`c`.`is_deleted` =0
AND
`c`.`status` = 1
AND
`ur`.`user_id` != 4
GROUP BY `c`.`id`
HAVING `c`.`amt_req` > COUNT(`ur`.`id`) + COUNT(`rr`.`id`)
Edit: Table structures: First Image - user_reviews Table, Second image campagin Table, Third image: reserved_reviews Table.
http://imgur.com/GI4817B,SdnSxuz,truxHM6#0

Answer 1

You can improve this query with indexes;
SELECT *, c.id c_id
FROM campaign c JOIN
campaign_category cc
ON c.campaign_type = cc.id
WHERE c.is_deleted = 0 AND
c.status = 1 AND
c.id NOT IN (SELECT campaign_id FROM user_reviews WHERE user_id = 4)
c.amt_req > (SELECT COUNT(*)
FROM reserved_reviews
WHERE campaign_id = c.id AND user_id <> 4)
) +
(SELECT COUNT(id)
FROM user_reviews
WHERE campaign_id = c.id
) ;
For the outer query and joins: campaign(status, is_deleted, id, amt_req) and campaign_category(id) (you should have the latter if it is defined as a primary key.
Then: user_reviews(user_id, campaign_id), reserved_reviews(campaign_id, user_id), and user_reviews(campaign_id).