Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9ffe55f4bdec238a7bb4539b39bdb84250456cc9ce33ce93eef202b26e5d5a' 
  AND token = 'XJ0KWH0+UUp4TOUH96FWJeIk0JQcpC/d/2kLSP/1yW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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