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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e94fe5a7ed11ca70cdc74dc2848a6623256b7c39f2537a02d0128bfea3438b' 
  AND token = 'MniyshworWL8+Gb8Ynlm9U63aeGO/l+M84JiG1wALlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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