SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7536f2253776c97a4764e682a37ffb568e3a4458c12ef8d54e091fcd0872c0' 
  AND token = '5No/PjzmJxyxHTr5o1iGyiCXDS9+sVYQkHXshdCbZ5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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