SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5ae58f10f1d98d535b78ac91189735bde0e954cc68819c8cd9d0ea969c40d4' 
  AND token = 'RGV0QX+eh4LOIGNKNMaydIs4Dq88C81OV+xY3QLVHu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables