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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a72a1dd0324d77295a81237668b7ca102720f5d91aa7d4b558b8f34c568d48' 
  AND token = 'XKQ3uQo4TtjzxP3RU03QJuYAopj9FQ6RG2LYwNFNzPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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