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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09eba6ed7cc84185371b388d7538cee5022db411b7e0674cc00c2ee831fc2ed' 
  AND token = 'y2mZPbzyUmLTgmGeGGgRC57gSAK/pd/2UwzDc+bSWIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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