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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c55dde126b75e155a700a16e07df44c91bd6dfd837f2537227676f87cf6013' 
  AND token = 'DiUYmF9lS9dxfoXtm9Ai7WbI0gGq2E1rjfKXYxfdCfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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