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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f01b18ceb6d47651505722885f899c438a766c283a93b8f647fea719094c130' 
  AND token = 'knnQyHr80csf6LtBjeMK3u3djgg1XCh69ZKbhtNz+bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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