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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d54f46ad280e1c603aa88b4534203335fb7c3b47c9e2f957c1f24306444634' 
  AND token = 'Twyf6DRvceYnP/FkSEEOj8GVm5Aad0VWfJppUKw1vmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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