Laravel Issue in getting record from mongo

I am using jenssegers mongodb package for connecting Laravel with mongo. I have a collection named consumer_report in which there is a key name as consumer_id which is an Object Id. i want to match with my id.but it does not show any error.

Here is my query

$val = DB::connection('mongodb')->collection('consumers_locations')->where('consumer_id','='57b33c810a56a0a81a9b50b7')->get();

via Chebli Mohamed