Combine tomato, basil, 1/4 teaspoon kosher salt, and 1/8 teaspoon freshly ground black pepper; toss gently.
Heat a large cast-iron or heavy skillet over high heat.
Add oil to pan, swirling to coat. Pat scallops dry with paper towels; sprinkle with 1/2 teaspoon kosher salt and 1/8 teaspoon freshly ground black pepper.
Add scallops to pan; cook 2 minutes or until browned. Turn scallops; cook 2 minutes or until done.
Remove scallops from pan; keep warm. Coat pan with cooking spray.
Add corn to pan; saut 2 minutes or until lightly browned.