SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2318f635e5ca9bd33ac0ae2d563e74072e9031d499ec4824982d84f7a6449d59' 
  AND token = 'g/WKcqN7FkdD34Hphj5+EIgYQkG6jvvMfm8l8gBrrkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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