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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9136b284b2928e3f7d9b3125a2500666338cf3b09f51048960cb86a43e9d4af8' 
  AND token = '1A6VacaefFbKgzQXgUwVMswAJ67YLcQwr9OCxvzf46k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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