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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cba97d1ad81e69f2eaa5bd641659c8de8aef0b15c90217609a99f05b44bace' 
  AND token = 'bb7ieOlG0qEgsDlg6nLGKBxq4BmuBt01eBMauVf2G7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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