How to increment and update column in one eloquent query

You can use the DB::raw method:

Product::where('product_id', $product->id)
    ->update([
      'count'=> DB::raw('count+1'), 
      'last_count_increased_at' => Carbon::now()
    ]);

You can specify additional columns to update during the increment or decrement operation:

Product::where('id',$id)
->increment('count', 1, ['increased_at' => Carbon::now()]);

It is more eloquent solution.