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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bfbf27ccd80b7bfd396794182359989f774092e0ffec8e5c28e135e7615c492' 
  AND token = 'j+WwMQMY7HJwFn1sWYoFw4ph5FWWa7u4wfopvV4Zkdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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