SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99cae7b67fc719f9469314d45d37af7bc556da880c5e1ab512b6814121e4057' 
  AND token = 'tC81Zt3o7X3hZfP/wSXtPDsXUF/ACljRwGvJ3zs3gaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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