Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a428e3564159dbceb2a61b914e97230e5357d6d11ca7ecacb190ddb9b78a6697' 
  AND token = 'FkFQglAlgE2MT1a7eMPEYzaCG2/UEJttI72XDCgG/mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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