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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8bb023b5b6d6cc1d40f35b28297ab2c1781230deb431ba348a57f952f24207' 
  AND token = 'xhEE7b9xSWNI6s2+WdEghf1X3w7UUSsMSki088zb4pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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