Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb54924acb89c8ba5ecd5e1d051add80457c681d06e1ad89555b8587286a6810' 
  AND token = 'Bk/Ru6SudTevwDZIE9Vpwg8T+cpZBnGs6SdUKE/6EDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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