如何在laravel中使用索引？

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateUsersTable extends Migration
{
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('email')->unique();
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password');
            $table->index('name'); // 添加普通索引
            $table->timestamps();
        });
    }

    public function down()
    {
        Schema::dropIfExists('users');
    }
}

// 使用 Eloquent ORM
$users = App\Models\User::where('name', 'John')->get();

// 使用 Query Builder
$users = DB::table('users')->where('name', 'John')->get();

EXPLAIN SELECT * FROM users WHERE name = 'John';