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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2fa6f652ab27d78c2977ac28c8a2468dea06a982ba405bdd91e7b56bf27d72' 
  AND token = 'bYLEEgQ/VU1X33b7guZ7k8uAxtDymUdlHe7UDLfDm7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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