SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '722b75b71eabef455d1b1a69f0f26bb5fdaabd0a444259263292d35bbdd82bfd' 
  AND token = 'wNZ1BS/TpYzuI1zLjahb8u9BWZJLUEBoJIjir8mnRK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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