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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1eddbf898274e14c3446056919a189f93a229535561254fa48c25632dab88d' 
  AND token = '/or5pN14HnNLraHA6wjtRBizpI3/Vz/4aO2R0oTwktA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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