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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39821355196886f2dc93f205e8a8519e749775252fee2e03993a655d8b42ae4' 
  AND token = 'vJgje5dIBbushfH4N/02+F51eBklmnYBWDj8dIxcBIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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