SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3c784195a1bd2b8c7e0b9a755513e9b298f293fea29e6662c02ffe0044ec3a' 
  AND token = 'rylp+q/ilvOZ8/HYHstiCVQh17on3ydfGiGz+Z4I/7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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