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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3117c54269a4e2a3109dd3d05cc933c050ad70e3bd6ba3e05d6b07b64198d0dd' 
  AND token = 'iZBGYOs2wyjVhn8Cb73KzH/eyzFceFCXXn3pSbIFwmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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