Case sensitive query in yii2

I think you should use LIKE BINARY

and for this you should extended you modelSearch adding the clause in query condition

public function search($params)
{
    $query = YuorModel::find();      
    .......
    .......

    $query->andFilterWhere(['like binary', 'unique_url', $this->unique_url])
          ->andFilterWhere(['like', 'your_field2', $this->your_field2])
    .......