SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2affcfb4d7d759116a40a585aa73aadf4bb85b3d99d6b7e4a9dd578fb7792f54' 
  AND token = 'GclWl5huEF4mUOU2n4zXIU/g2o+PERFwzfLjBOGB7jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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