use exists for has

src/drivers/redis.ts

@@ -16,6 +16,10 @@ export class RedisDriver extends BaseDriver {
     this.redlock = new Redlock([this.redis], options.lock);
   }
 
+  override async has(baseKey: string, key: string) {
+    return (await this.redis.exists(this.usingKey(baseKey, key))) !== 0;
+  }
+
   override async get(baseKey: string, key: string): Promise<Buffer> {
     return this.redis.getBuffer(this.usingKey(baseKey, key));
   }