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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138adb12e4f72a8486525f8a3512f82f4a37f14408aa2bf04aa507e5a92e8668' 
  AND token = 'cTh/fwS4V9AwPifQb64m+sQDCi4zgJBMj1tnl0xLPSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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