SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7465972930db683e2d6727641b07f0918bb1985c2118b11277ef45f28c5166' 
  AND token = 'LSX0ZvnkKHURTtQVI/eODzqudlHlROvR54qY/nHZdE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00305

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}