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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad780cd001ac45855bcaa671d1c3c9f1b3dca7a0f7b11af5462e6de2b48b544' 
  AND token = 'rieg+lXxaHeFdg8EU6RXMojg5KGjvXZXceJYL4KnfCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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