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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3c7bd98022846fa6fb5e05938555711ae3f69debd2869735f6dc968bcdf644' 
  AND token = 'FxSjHRRssX2k55mFFaijdeBrMgNRMSYTRXdhOFaeB2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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