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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c1398f2e8d40957225c418afe8b5b38ce2eeaee62f6717cc9b9bc46df74755' 
  AND token = 'Db7iV7fS0qnvMssFrtlOmpfH1somEsSzTQCt19KA21Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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