SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f32351be2f41580740e111d26ac59dfa2a84641aec638ade2c3b284665636bb' 
  AND token = 'I6NmW6wv0FTIZEvmEOftuC4HxvgmsP5OVBGPk7K3rp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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