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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494a66ff32ebcb8f4e763acff81943012c3addc13e4278fa4f580030c26bceb8' 
  AND token = '9Wrr6A1+DEYT0WoWj2cUKhTAXkhiEFKlI41c1LGlbkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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