SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d6bbdac459f40e39c0191a01d045267761fe5b2e197ce912e38dce1db8e85c' 
  AND token = 'bwGlAPjQDEti8uYPAurVvjWgI4UyoqW/z5z8ILOXbC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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