SELECT 
  p.product_id, 
  ifnull(
    count(dp.post_id), 
    0
  ) as discussion_amount_posts 
FROM 
  cscart_discussion 
  INNER JOIN cscart_products as p ON (
    cscart_discussion.object_id = p.product_id
  ) 
  INNER JOIN cscart_discussion_posts as dp ON (
    cscart_discussion.thread_id = dp.thread_id 
    AND cscart_discussion.object_type = 'P' 
    AND cscart_discussion.company_id = 1
  ) 
WHERE 
  dp.status = 'A' 
  and p.product_id in (
    51567, 51480, 51565, 51564, 51479, 139, 
    129, 51566, 51301, 51494, 51, 50, 51497, 
    51498, 51495, 51563, 53, 22713, 21, 
    22714, 22712, 46, 22715, 22716, 51496, 
    21567, 91, 50989, 105, 48, 49, 92
  ) 
GROUP BY 
  p.product_id