SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17310f90b922bc351c824638df8c9ba2bdf3361858a4f6d62e0fa5d075b0cac' 
  AND token = 'VmuV+3D/6viYkl/vrft6F0APUsjL9gQu6jakXhC6ZyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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