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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd60404ede2b0b431e27447c75190cea1b435059aa0acc3fd3a27e5f1e5a0fb' 
  AND token = '3uCXSgbWUSna/R57iw1M88+xNsRHURXt5tUZ52GHUHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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