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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4567c5422ef170ce7e24ec854c2c0bd18b8489718747698bc0a26a5aa50c6af' 
  AND token = 'LbVxxEfhZh1ZLxOMI8wkMwUlRzEGTW8YX7TrI/qqKKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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