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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a37907d9e1938e3fb1d972c8e548578b86d8b4d44621dd067c6f7c1899d5ac' 
  AND token = 'rndXRoCRouYePrFJW1hiNg0+KrF9PmpZn+iTPm8HB9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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