tanga_dev=# SELECT id FROM "products" WHERE (start_sale_date < now() and category_id = 1 and id != E'20') ORDER BY start_sale_date desc;
 id
----
 13
  2
 15
 25
 33
(5 rows)

tanga_dev=# SELECT id FROM "products" WHERE (start_sale_date < now() and category_id = 1) ORDER BY start_sale_date desc;
 id
----
 20
 13
  2
 15
 25
 33
(6 rows)