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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd31b6f64ef5c490e4e63e93ceb6336ed0facc35c571fbc23dfd9f23abb6c31' 
  AND token = 'u/fUo63063mQ5XWqXknux39HKfXUk2kmfOPBV6tPHQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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