Laravel store method

I want to make store eloquent to be more simplified to something like this:

$keyword = Keyword::create([
        'keyword'       => $request->input('keyword'),
        'micro_price'   => $request->input('micro_price'),
        'macro_price'   => $request->input('macro_price'),
        'cmd'           => $request->input('cmd'),
]);

Instead of this:

    $keyword = new Keyword;
    $keyword->keyword = $request->input('keyword');
    $keyword->micro_price = $request->input('micro_price');
    $keyword->macro_price = $request->input('macro_price');
    $keyword->cmd = $request->input('cmd');
    $keyword->user()->associate(Auth::user());
    $keyword->server()->associate($request->input('title'));
    $keyword->save();

But there is a problem that I have in keywords database table with 2 foreign keys (server_id and user_id) and I want that my eloquent model assign these 2 foreign keys properly, but I have no idea how to make that in simplified version.

Thanks in advance for help !