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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032caf0b30a29d0d1db558940fd0818e5524de54ac1a80bff9cb80883b243137' 
  AND token = 'KvVHsjd8ghBzupFbpSxpn3KTVmclqsFK83W9lqS8FDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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