on duplicate key update in laravel 5.0 eloquent

I have a table "app_sessions" in my database with a composite unique key on device_id and device_token. I want to insert a new session in this table only if the record with device_id or device_token doesn't exist, otherwise just update the session for this record.

We can do this with a "insert .... on duplicate key update ....." query. But how can we achieve this using laravel 5.0 eloquent.

Note: We all know the other ways to do it, like fetching the record first and then inserting or updating depending on the results.

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