Heat vegetable juice, chili powder and cumin in 1 1/2-quart saucepan to boiling. Stir in corn and zucchini. Cover and cook over medium heat 3 to 5 minutes, stirring occasionally, until vegetables are tender. Stir in salt. Cover and refrigerate about 2 hours or until chilled. Serve salad on lettuce leaves if desired. Drizzle with lime juice.