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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee7524e3fff5e0c67ea93b0bf8fd200942634c7feba52a967d26a90986ff5be' 
  AND token = 'WvFPzW+ZK94k0h5/acLIQN+Pfvd5AzVOR0RpyKcboww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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