SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922dc8054b112e90e3d86c6149f58e52535a7199ced0983dc60fcf82e027104f' 
  AND token = 'KiHOYHBy4PF/lz3ZJgtLorPAw+zEbpLw1b4WbVViO7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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