SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cfbfb7c884122708dfbd8de1b038055e25421d04983d704099825afb3e5071' 
  AND token = '6AU/GByTDVmKtlVqhIRVsRcwbLcbMPwYnZzOiULHwHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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