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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d05a6e40adff90ba8842c6959250df35f3858fbf1d6a2b48b39ff5a47904ae3' 
  AND token = 'FOECG8ZTRUzf5Cp/PAkiUxWkUIZ2sIu9KuiiMChLkl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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