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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089e6f6f5c42db8adb051890cfeeff0cab4773e185ca854c2b9188da91af9dd7' 
  AND token = '9VJf3l6OZuTfL071djLMbj8ANdtEd2iXVh1YPVQo8rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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