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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85af3f113f51a80719d60f50ed7ba130db432635ce9f5150a7c8d8f3683628d2' 
  AND token = 'LAHJejnxUj0T1BKr0f22c1sPesIvW3ATznp14mFDseU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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