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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89c57eba0bf80675039af79d8bf049acc26d4f8531abd26502a32eeb0a21c83' 
  AND token = '9Mq3/4kXMdBW3FNQKuhgo4BWlMWX+pG7cpm1TVo5NNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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