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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afefc99e8791828f242210bc8ac8f62d5e904ac5a1fd02712955d465dfb4037' 
  AND token = 'aE/5M0WJCThIHc5ETSeHYNv6lmU+IH9QKUYvNgEKphI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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