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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9ad9982914514fa755c882ccd7481e17dc1894b62b6dc1e3202943cf9dfed7' 
  AND token = 'baqHQnuzSQepY+ICsgsqnQwHRrxDNtm5Ui3HhnYoTRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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