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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612ae99897af120eccf25534f4de6e6d9a4a6dfc91c9c8fb1fb1434e59a9a793' 
  AND token = 'oL4GoswmokhiS0bRrPO83vIY5BoaFzHGmvEugNy653g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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