SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f05ed5e997036c424b22f16f1e79accc7aee952ca5af52f96b476f314bb657' 
  AND token = 'fhATHEGD2vPiLXFh0q2PrdxzJB0A8PcgWF8ZGthqn+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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