QUERY PLAN
Update on tbl_unread_comments (cost=0.00..6604.43 rows=1 width=26)
-> Seq Scan on tbl_unread_comments (cost=0.00..6604.43 rows=1 width=26)
Filter: (((object_type)::text = '20031'::text) AND (object_id = 10) AND (remind_user_id = 1000))