After setting up Oscar's opener, Lampard, who began the game as a substitute, converted a 45th-minute penalty to move within one of the club record held by the watching Bobby Tambling.
Benitez said: "He's a great professional. He's always really focused.
"He would like to play more games, but he understands the main thing is the team and to qualify for the Champions League.
"He wants to play, but he understands the team is first."