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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c69baf4e736fcc042b3157a8d168b9e94d0bd92512a32dd8075c8766651a84' 
  AND token = 'Hv0C/OGQZ5CNnAghYm2y0CST6kUIsQQxCB01UFZkofA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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