In a mixing bowl, combine yogurt, mayonnaise, lemon juice, salt, and pepper. Whisk until smooth, about 1-2 minutes.

Bring a large pot of water to a boil. Add pasta and cook according to package instructions until al dente, about 8-10 minutes. Drain and cool under cold water.

Slice English cucumber and red onion thinly, and place them in a large mixing bowl.

Once cooled, add the pasta to the bowl with cucumber and onion, and toss gently to combine.

Pour the dressing over the salad and mix thoroughly to coat all ingredients.

Cover the salad and refrigerate for at least 30 minutes before serving to enhance flavors.