SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443f928d5b3225fd5d0ecacb3971618cc104e94bf1bbaabaa2f215e2298486c8' 
  AND token = 'cv4qLQslt5CXzClhtG2NKwkraA7x4rBgCgKi//hC/C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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