Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5fe9346d1bf57b56ef01faef57cdf34d16f72ec8d51fc6fb41fa26936b44e26' 
  AND token = '7ianGxMLEZD9x3kjMICkxTdpbjV1CfN2j6Ij1XnydIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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