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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c107e2427b35cf107fbe8d5936c6f8bbb37949c49e728a6ee10f15a01e1391' 
  AND token = 'HGVclSP71oez7If9tvdavlZQzV44VAMvVJZZDwFPJZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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