Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794487173bf4a5c4d1db1ea9216a2a82d94eb14d0b4b3536d14b185b021499cc' 
  AND token = '0EWtBvJtMrIcZsQYiUt6ngWQrThXJD4YgMI5zE2g2K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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