SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9a67261d5a8f46bcfa44b503225c499cf84494eb9b077fa25979b47b5ee662' 
  AND token = 'qdh2tCZauJfZaCojgRuu4CfjWXhhYhTRV1kg+HkWAOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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