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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e6fa29c3e33768f4fc6c4bd221ac20f63b339908c657898773371bacde2c84' 
  AND token = 'mdUZpmsJvfdS2XEJ+UfnvBJ5zVULMPd/3o3Z6g9HEFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}