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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff67c3f72a2d09ee0d92f1c69fab5b8ba80fe8e1c93361b23e6d49f903d5942' 
  AND token = 'LquvcoJY4libsepIY7S5ido4BdGbQx2rl2x+uYZGM1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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