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    def _key_exists(self, bucket, key):

        s3 = boto3.resource(
            's3',
            aws_access_key_id=settings.AWS_ACCESS_KEY,
            aws_secret_access_key=settings.AWS_SECRET_KEY,
        )
        exists = False

        try:
            s3.Object(bucket, key).load()
        except botocore.exceptions.ClientError as e:
            if e.response['Error']['Code'] == "404":
                exists = False
            else:
                raise
        else:
            exists = True

        return exists