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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023abfbba9697e6ae7608a0d7913adb0f5a65f597d84618ba3224a966bf799ab' 
  AND token = 'aENH8/oK0CT0pCDYMq8pcyFMF249tWaA9M9NsAlZgJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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