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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '163e5ed3197ec67ba4ca4ba9bf4bee12eff03d4edf12ac98e4a2013dc074e1e9' 
  AND token = 'XOlald6/k5xTREsclYvXlllGNelT5D53Z8l/MtyfoZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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