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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fa1afa7953afb86c256af9879dc1059fe9e876c4b43bd878f523bbf5245ac3' 
  AND token = 'yNhpSQBawkefpaLsSdPwlU0hKZSWRtCSD/gCY6307wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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