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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e99005f0853eb6c0269c8cca44c7649986b9202e019fed6e3f8e2b62eddb09' 
  AND token = '1lsUDiyDVUtKV4KwcVlGAjaecwoZhndG7OsgE3RpfAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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