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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5792b6de236e0cff2123e598cc381af9a95a86f03ef8f92c0dcd3b24e7ed0b' 
  AND token = 'YI9jEZ9i+GXhLF/1QN9kO8rubyh8vkX3c+vDiVo9UfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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