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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a80c44540331a5daa0e8b299a366d795b3e91b95ab32febaeaa94db3b771f915' 
  AND token = '3TPD2flHx5UdYhPwFmQ1uArf/3J5wxtTkxA0T55fvos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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