SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a85b3e2c87ed4cbd477286df966da7f93e5667c922967f545ceff85fad8720a' 
  AND token = 'IIq3fw1PGJb6sw0JsZx3gyM/eXVGeUvQnc+u8TMopoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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