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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452c2d59e3cd575d5ab88e6a473ec88c2e15dc64b01172154cf80a599d28a08d' 
  AND token = 'hnfsCvWsyh2wwqG1ME4NA1NBxMtSosz7+Eam2sQvoUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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