SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2921cf47402a2334286422d254f335d94866cbd517ffba5e4e362b93a6705e' 
  AND token = 'rTK/zosBRbjh/9I2yqj5wgqIxnyoHVneUNnWqNGi7JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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