Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5921eb802d383d35c9cc7739dff1cf193452b652d3b860067d73749aeccf324a' 
  AND token = 'pb93rhprh9Nh0fWmHRlgfxj389TMlEDvzQmtcNmN+o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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