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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dde9209366285a32e65df42995a20fa0e283f766827b90190de77cb52595b63' 
  AND token = 'aIJuh8TeC53b2DO2SZu1yHM12zZesS22hKKuPBqrLpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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