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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d841b0d79e5c020f6829490a3ed80c4bbe50f26469a8e2632ef1006d2e1a1e' 
  AND token = 'H8FRpmvBtWdNzZu53z8emaItZotZ/XJnnqRayrDpe3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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