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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588dd3e804681d10ae59cae08ba97e684f28d8a8ea2431e6ae7af9b87edb37db' 
  AND token = 'Jpy0tgt/7Fpj6yUi3eFGqjSaxHYPxdedEcg+fBuVHcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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