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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de737d8eaee1d5b7a90f1fda2aff0da41157e966a67345b7b80872059a57cb3e' 
  AND token = 'AilNqVGB+uUdaKV9TbdFDMsNeG4yLLbZD3Obnf63XEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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