SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3218ab33932b80cc44893142d78e05fdc4f274b758b5f31e5f4b07a165fff6' 
  AND token = 'KfytHhEwvghN8BsTPWeVDCvG8kQiESYqx5GGgkCGrEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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