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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2a674be73b12325a384150975fd49104d5013d423a78e9c1ce860dcdafe9c6' 
  AND token = 'ayn+lkVcREBbE8bAFncWGS1SkwCwiHpWhV5nAcZHmBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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