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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94b22e8fcac4dff78ab4a75f2e73cf8b3c08872b82401b846dce400f7e85241' 
  AND token = 'ZNZquX3U6OWYBrxuHFsZtvUR8kRbhNy8/qxEA+2F8eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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