SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b702a4f74494ad9d885f9057e25c54dea50bff8e71742c2074bb83cd96bca665' 
  AND token = 'VVJcW3sRqXOz1XC50YLn+QKLfnJaWo8l/dGbtCOsXEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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