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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69466df656ef696709192ff96283f51adc56167b01eca7592377f8baa9767b3c' 
  AND token = '6W/UtgBKZ7kO+ctw/WZQUCDlUKFMC155EnvTJA4QCA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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